Yeast sporulation

Dear Netters:
In my experiments, I found that sporulation of the yeast (Schizo. pombe)
was inhibited by YE medium (0.5% yeast extract, 3% glucose). However,
the same strain can sporulation in the YEPD medium (1% yeast extract,
2% peptone, 2% glucose).
Does anyone have the information about these conditions?
Please contact me by the e-mail.
Thanks!
Tien-Shin Yu.
MBMTCHAN at ccvax.as.edu.tw.